1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *  Abstract layer for MIDI v1.0 stream
   4 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   5 */
   6
   7#include <sound/core.h>
   8#include <linux/major.h>
   9#include <linux/init.h>
  10#include <linux/sched/signal.h>
  11#include <linux/slab.h>
  12#include <linux/time.h>
  13#include <linux/wait.h>
  14#include <linux/mutex.h>
  15#include <linux/module.h>
  16#include <linux/delay.h>
  17#include <linux/mm.h>
  18#include <linux/nospec.h>
  19#include <sound/rawmidi.h>
  20#include <sound/info.h>
  21#include <sound/control.h>
  22#include <sound/minors.h>
  23#include <sound/initval.h>
  24
  25MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  26MODULE_DESCRIPTION("Midlevel RawMidi code for ALSA.");
  27MODULE_LICENSE("GPL");
  28
  29#ifdef CONFIG_SND_OSSEMUL
  30static int midi_map[SNDRV_CARDS];
  31static int amidi_map[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS-1)] = 1};
  32module_param_array(midi_map, int, NULL, 0444);
  33MODULE_PARM_DESC(midi_map, "Raw MIDI device number assigned to 1st OSS device.");
  34module_param_array(amidi_map, int, NULL, 0444);
  35MODULE_PARM_DESC(amidi_map, "Raw MIDI device number assigned to 2nd OSS device.");
  36#endif /* CONFIG_SND_OSSEMUL */
  37
  38static int snd_rawmidi_free(struct snd_rawmidi *rawmidi);
  39static int snd_rawmidi_dev_free(struct snd_device *device);
  40static int snd_rawmidi_dev_register(struct snd_device *device);
  41static int snd_rawmidi_dev_disconnect(struct snd_device *device);
  42
  43static LIST_HEAD(snd_rawmidi_devices);
  44static DEFINE_MUTEX(register_mutex);
  45
  46#define rmidi_err(rmidi, fmt, args...) \
  47	dev_err(&(rmidi)->dev, fmt, ##args)
  48#define rmidi_warn(rmidi, fmt, args...) \
  49	dev_warn(&(rmidi)->dev, fmt, ##args)
  50#define rmidi_dbg(rmidi, fmt, args...) \
  51	dev_dbg(&(rmidi)->dev, fmt, ##args)
  52
  53struct snd_rawmidi_status32 {
  54	s32 stream;
  55	s32 tstamp_sec;			/* Timestamp */
  56	s32 tstamp_nsec;
  57	u32 avail;			/* available bytes */
  58	u32 xruns;			/* count of overruns since last status (in bytes) */
  59	unsigned char reserved[16];	/* reserved for future use */
  60};
  61
  62#define SNDRV_RAWMIDI_IOCTL_STATUS32	_IOWR('W', 0x20, struct snd_rawmidi_status32)
  63
  64struct snd_rawmidi_status64 {
  65	int stream;
  66	u8 rsvd[4];			/* alignment */
  67	s64 tstamp_sec;			/* Timestamp */
  68	s64 tstamp_nsec;
  69	size_t avail;			/* available bytes */
  70	size_t xruns;			/* count of overruns since last status (in bytes) */
  71	unsigned char reserved[16];	/* reserved for future use */
  72};
  73
  74#define SNDRV_RAWMIDI_IOCTL_STATUS64	_IOWR('W', 0x20, struct snd_rawmidi_status64)
  75
  76static struct snd_rawmidi *snd_rawmidi_search(struct snd_card *card, int device)
  77{
  78	struct snd_rawmidi *rawmidi;
  79
  80	list_for_each_entry(rawmidi, &snd_rawmidi_devices, list)
  81		if (rawmidi->card == card && rawmidi->device == device)
  82			return rawmidi;
  83	return NULL;
  84}
  85
  86static inline unsigned short snd_rawmidi_file_flags(struct file *file)
  87{
  88	switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) {
  89	case FMODE_WRITE:
  90		return SNDRV_RAWMIDI_LFLG_OUTPUT;
  91	case FMODE_READ:
  92		return SNDRV_RAWMIDI_LFLG_INPUT;
  93	default:
  94		return SNDRV_RAWMIDI_LFLG_OPEN;
  95	}
  96}
  97
  98static inline int snd_rawmidi_ready(struct snd_rawmidi_substream *substream)
  99{
 100	struct snd_rawmidi_runtime *runtime = substream->runtime;
 101
 102	return runtime->avail >= runtime->avail_min;
 103}
 104
 105static inline int snd_rawmidi_ready_append(struct snd_rawmidi_substream *substream,
 106					   size_t count)
 107{
 108	struct snd_rawmidi_runtime *runtime = substream->runtime;
 109
 110	return runtime->avail >= runtime->avail_min &&
 111	       (!substream->append || runtime->avail >= count);
 112}
 113
 114static void snd_rawmidi_input_event_work(struct work_struct *work)
 115{
 116	struct snd_rawmidi_runtime *runtime =
 117		container_of(work, struct snd_rawmidi_runtime, event_work);
 118
 119	if (runtime->event)
 120		runtime->event(runtime->substream);
 121}
 122
 123/* buffer refcount management: call with runtime->lock held */
 124static inline void snd_rawmidi_buffer_ref(struct snd_rawmidi_runtime *runtime)
 125{
 126	runtime->buffer_ref++;
 127}
 128
 129static inline void snd_rawmidi_buffer_unref(struct snd_rawmidi_runtime *runtime)
 130{
 131	runtime->buffer_ref--;
 132}
 133
 134static int snd_rawmidi_runtime_create(struct snd_rawmidi_substream *substream)
 135{
 136	struct snd_rawmidi_runtime *runtime;
 137
 138	runtime = kzalloc(sizeof(*runtime), GFP_KERNEL);
 139	if (!runtime)
 140		return -ENOMEM;
 141	runtime->substream = substream;
 142	spin_lock_init(&runtime->lock);
 143	init_waitqueue_head(&runtime->sleep);
 144	INIT_WORK(&runtime->event_work, snd_rawmidi_input_event_work);
 145	runtime->event = NULL;
 146	runtime->buffer_size = PAGE_SIZE;
 147	runtime->avail_min = 1;
 148	if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 149		runtime->avail = 0;
 150	else
 151		runtime->avail = runtime->buffer_size;
 152	runtime->buffer = kvzalloc(runtime->buffer_size, GFP_KERNEL);
 153	if (!runtime->buffer) {
 154		kfree(runtime);
 155		return -ENOMEM;
 156	}
 157	runtime->appl_ptr = runtime->hw_ptr = 0;
 158	substream->runtime = runtime;
 159	return 0;
 160}
 161
 162static int snd_rawmidi_runtime_free(struct snd_rawmidi_substream *substream)
 163{
 164	struct snd_rawmidi_runtime *runtime = substream->runtime;
 165
 166	kvfree(runtime->buffer);
 167	kfree(runtime);
 168	substream->runtime = NULL;
 169	return 0;
 170}
 171
 172static inline void snd_rawmidi_output_trigger(struct snd_rawmidi_substream *substream, int up)
 173{
 174	if (!substream->opened)
 175		return;
 176	substream->ops->trigger(substream, up);
 177}
 178
 179static void snd_rawmidi_input_trigger(struct snd_rawmidi_substream *substream, int up)
 180{
 181	if (!substream->opened)
 182		return;
 183	substream->ops->trigger(substream, up);
 184	if (!up)
 185		cancel_work_sync(&substream->runtime->event_work);
 186}
 187
 188static void __reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 189				 bool is_input)
 190{
 191	runtime->drain = 0;
 192	runtime->appl_ptr = runtime->hw_ptr = 0;
 193	runtime->avail = is_input ? 0 : runtime->buffer_size;
 194}
 195
 196static void reset_runtime_ptrs(struct snd_rawmidi_runtime *runtime,
 197			       bool is_input)
 198{
 199	unsigned long flags;
 
 200
 
 
 201	spin_lock_irqsave(&runtime->lock, flags);
 202	__reset_runtime_ptrs(runtime, is_input);
 
 203	spin_unlock_irqrestore(&runtime->lock, flags);
 204}
 205
 206int snd_rawmidi_drop_output(struct snd_rawmidi_substream *substream)
 207{
 208	snd_rawmidi_output_trigger(substream, 0);
 209	reset_runtime_ptrs(substream->runtime, false);
 210	return 0;
 211}
 212EXPORT_SYMBOL(snd_rawmidi_drop_output);
 213
 214int snd_rawmidi_drain_output(struct snd_rawmidi_substream *substream)
 215{
 216	int err;
 217	long timeout;
 218	struct snd_rawmidi_runtime *runtime = substream->runtime;
 219
 220	err = 0;
 221	runtime->drain = 1;
 222	timeout = wait_event_interruptible_timeout(runtime->sleep,
 223				(runtime->avail >= runtime->buffer_size),
 224				10*HZ);
 225	if (signal_pending(current))
 226		err = -ERESTARTSYS;
 227	if (runtime->avail < runtime->buffer_size && !timeout) {
 228		rmidi_warn(substream->rmidi,
 229			   "rawmidi drain error (avail = %li, buffer_size = %li)\n",
 230			   (long)runtime->avail, (long)runtime->buffer_size);
 231		err = -EIO;
 232	}
 233	runtime->drain = 0;
 234	if (err != -ERESTARTSYS) {
 235		/* we need wait a while to make sure that Tx FIFOs are empty */
 236		if (substream->ops->drain)
 237			substream->ops->drain(substream);
 238		else
 239			msleep(50);
 240		snd_rawmidi_drop_output(substream);
 241	}
 242	return err;
 243}
 244EXPORT_SYMBOL(snd_rawmidi_drain_output);
 245
 246int snd_rawmidi_drain_input(struct snd_rawmidi_substream *substream)
 247{
 
 
 
 248	snd_rawmidi_input_trigger(substream, 0);
 249	reset_runtime_ptrs(substream->runtime, true);
 
 
 
 
 250	return 0;
 251}
 252EXPORT_SYMBOL(snd_rawmidi_drain_input);
 253
 254/* look for an available substream for the given stream direction;
 255 * if a specific subdevice is given, try to assign it
 256 */
 257static int assign_substream(struct snd_rawmidi *rmidi, int subdevice,
 258			    int stream, int mode,
 259			    struct snd_rawmidi_substream **sub_ret)
 260{
 261	struct snd_rawmidi_substream *substream;
 262	struct snd_rawmidi_str *s = &rmidi->streams[stream];
 263	static const unsigned int info_flags[2] = {
 264		[SNDRV_RAWMIDI_STREAM_OUTPUT] = SNDRV_RAWMIDI_INFO_OUTPUT,
 265		[SNDRV_RAWMIDI_STREAM_INPUT] = SNDRV_RAWMIDI_INFO_INPUT,
 266	};
 267
 268	if (!(rmidi->info_flags & info_flags[stream]))
 269		return -ENXIO;
 270	if (subdevice >= 0 && subdevice >= s->substream_count)
 271		return -ENODEV;
 272
 273	list_for_each_entry(substream, &s->substreams, list) {
 274		if (substream->opened) {
 275			if (stream == SNDRV_RAWMIDI_STREAM_INPUT ||
 276			    !(mode & SNDRV_RAWMIDI_LFLG_APPEND) ||
 277			    !substream->append)
 278				continue;
 279		}
 280		if (subdevice < 0 || subdevice == substream->number) {
 281			*sub_ret = substream;
 282			return 0;
 283		}
 284	}
 285	return -EAGAIN;
 286}
 287
 288/* open and do ref-counting for the given substream */
 289static int open_substream(struct snd_rawmidi *rmidi,
 290			  struct snd_rawmidi_substream *substream,
 291			  int mode)
 292{
 293	int err;
 294
 295	if (substream->use_count == 0) {
 296		err = snd_rawmidi_runtime_create(substream);
 297		if (err < 0)
 298			return err;
 299		err = substream->ops->open(substream);
 300		if (err < 0) {
 301			snd_rawmidi_runtime_free(substream);
 302			return err;
 303		}
 304		substream->opened = 1;
 305		substream->active_sensing = 0;
 306		if (mode & SNDRV_RAWMIDI_LFLG_APPEND)
 307			substream->append = 1;
 308		substream->pid = get_pid(task_pid(current));
 309		rmidi->streams[substream->stream].substream_opened++;
 310	}
 311	substream->use_count++;
 312	return 0;
 313}
 314
 315static void close_substream(struct snd_rawmidi *rmidi,
 316			    struct snd_rawmidi_substream *substream,
 317			    int cleanup);
 318
 319static int rawmidi_open_priv(struct snd_rawmidi *rmidi, int subdevice, int mode,
 320			     struct snd_rawmidi_file *rfile)
 321{
 322	struct snd_rawmidi_substream *sinput = NULL, *soutput = NULL;
 323	int err;
 324
 325	rfile->input = rfile->output = NULL;
 326	if (mode & SNDRV_RAWMIDI_LFLG_INPUT) {
 327		err = assign_substream(rmidi, subdevice,
 328				       SNDRV_RAWMIDI_STREAM_INPUT,
 329				       mode, &sinput);
 330		if (err < 0)
 331			return err;
 332	}
 333	if (mode & SNDRV_RAWMIDI_LFLG_OUTPUT) {
 334		err = assign_substream(rmidi, subdevice,
 335				       SNDRV_RAWMIDI_STREAM_OUTPUT,
 336				       mode, &soutput);
 337		if (err < 0)
 338			return err;
 339	}
 340
 341	if (sinput) {
 342		err = open_substream(rmidi, sinput, mode);
 343		if (err < 0)
 344			return err;
 345	}
 346	if (soutput) {
 347		err = open_substream(rmidi, soutput, mode);
 348		if (err < 0) {
 349			if (sinput)
 350				close_substream(rmidi, sinput, 0);
 351			return err;
 352		}
 353	}
 354
 355	rfile->rmidi = rmidi;
 356	rfile->input = sinput;
 357	rfile->output = soutput;
 358	return 0;
 359}
 360
 361/* called from sound/core/seq/seq_midi.c */
 362int snd_rawmidi_kernel_open(struct snd_card *card, int device, int subdevice,
 363			    int mode, struct snd_rawmidi_file *rfile)
 364{
 365	struct snd_rawmidi *rmidi;
 366	int err = 0;
 367
 368	if (snd_BUG_ON(!rfile))
 369		return -EINVAL;
 370
 371	mutex_lock(&register_mutex);
 372	rmidi = snd_rawmidi_search(card, device);
 373	if (!rmidi)
 374		err = -ENODEV;
 375	else if (!try_module_get(rmidi->card->module))
 376		err = -ENXIO;
 
 
 
 
 377	mutex_unlock(&register_mutex);
 378	if (err < 0)
 379		return err;
 380
 381	mutex_lock(&rmidi->open_mutex);
 382	err = rawmidi_open_priv(rmidi, subdevice, mode, rfile);
 383	mutex_unlock(&rmidi->open_mutex);
 384	if (err < 0)
 385		module_put(rmidi->card->module);
 386	return err;
 387}
 388EXPORT_SYMBOL(snd_rawmidi_kernel_open);
 389
 390static int snd_rawmidi_open(struct inode *inode, struct file *file)
 391{
 392	int maj = imajor(inode);
 393	struct snd_card *card;
 394	int subdevice;
 395	unsigned short fflags;
 396	int err;
 397	struct snd_rawmidi *rmidi;
 398	struct snd_rawmidi_file *rawmidi_file = NULL;
 399	wait_queue_entry_t wait;
 
 400
 401	if ((file->f_flags & O_APPEND) && !(file->f_flags & O_NONBLOCK))
 402		return -EINVAL;		/* invalid combination */
 403
 404	err = stream_open(inode, file);
 405	if (err < 0)
 406		return err;
 407
 408	if (maj == snd_major) {
 409		rmidi = snd_lookup_minor_data(iminor(inode),
 410					      SNDRV_DEVICE_TYPE_RAWMIDI);
 411#ifdef CONFIG_SND_OSSEMUL
 412	} else if (maj == SOUND_MAJOR) {
 413		rmidi = snd_lookup_oss_minor_data(iminor(inode),
 414						  SNDRV_OSS_DEVICE_TYPE_MIDI);
 415#endif
 416	} else
 417		return -ENXIO;
 418
 419	if (rmidi == NULL)
 420		return -ENODEV;
 421
 422	if (!try_module_get(rmidi->card->module)) {
 423		snd_card_unref(rmidi->card);
 424		return -ENXIO;
 425	}
 426
 427	mutex_lock(&rmidi->open_mutex);
 428	card = rmidi->card;
 429	err = snd_card_file_add(card, file);
 430	if (err < 0)
 431		goto __error_card;
 432	fflags = snd_rawmidi_file_flags(file);
 433	if ((file->f_flags & O_APPEND) || maj == SOUND_MAJOR) /* OSS emul? */
 434		fflags |= SNDRV_RAWMIDI_LFLG_APPEND;
 435	rawmidi_file = kmalloc(sizeof(*rawmidi_file), GFP_KERNEL);
 436	if (rawmidi_file == NULL) {
 437		err = -ENOMEM;
 438		goto __error;
 439	}
 440	init_waitqueue_entry(&wait, current);
 441	add_wait_queue(&rmidi->open_wait, &wait);
 442	while (1) {
 443		subdevice = snd_ctl_get_preferred_subdevice(card, SND_CTL_SUBDEV_RAWMIDI);
 
 
 
 
 
 
 
 
 
 444		err = rawmidi_open_priv(rmidi, subdevice, fflags, rawmidi_file);
 445		if (err >= 0)
 446			break;
 447		if (err == -EAGAIN) {
 448			if (file->f_flags & O_NONBLOCK) {
 449				err = -EBUSY;
 450				break;
 451			}
 452		} else
 453			break;
 454		set_current_state(TASK_INTERRUPTIBLE);
 455		mutex_unlock(&rmidi->open_mutex);
 456		schedule();
 457		mutex_lock(&rmidi->open_mutex);
 458		if (rmidi->card->shutdown) {
 459			err = -ENODEV;
 460			break;
 461		}
 462		if (signal_pending(current)) {
 463			err = -ERESTARTSYS;
 464			break;
 465		}
 466	}
 467	remove_wait_queue(&rmidi->open_wait, &wait);
 468	if (err < 0) {
 469		kfree(rawmidi_file);
 470		goto __error;
 471	}
 472#ifdef CONFIG_SND_OSSEMUL
 473	if (rawmidi_file->input && rawmidi_file->input->runtime)
 474		rawmidi_file->input->runtime->oss = (maj == SOUND_MAJOR);
 475	if (rawmidi_file->output && rawmidi_file->output->runtime)
 476		rawmidi_file->output->runtime->oss = (maj == SOUND_MAJOR);
 477#endif
 478	file->private_data = rawmidi_file;
 479	mutex_unlock(&rmidi->open_mutex);
 480	snd_card_unref(rmidi->card);
 481	return 0;
 482
 483 __error:
 484	snd_card_file_remove(card, file);
 485 __error_card:
 486	mutex_unlock(&rmidi->open_mutex);
 487	module_put(rmidi->card->module);
 488	snd_card_unref(rmidi->card);
 489	return err;
 490}
 491
 492static void close_substream(struct snd_rawmidi *rmidi,
 493			    struct snd_rawmidi_substream *substream,
 494			    int cleanup)
 495{
 496	if (--substream->use_count)
 497		return;
 498
 499	if (cleanup) {
 500		if (substream->stream == SNDRV_RAWMIDI_STREAM_INPUT)
 501			snd_rawmidi_input_trigger(substream, 0);
 502		else {
 503			if (substream->active_sensing) {
 504				unsigned char buf = 0xfe;
 505				/* sending single active sensing message
 506				 * to shut the device up
 507				 */
 508				snd_rawmidi_kernel_write(substream, &buf, 1);
 509			}
 510			if (snd_rawmidi_drain_output(substream) == -ERESTARTSYS)
 511				snd_rawmidi_output_trigger(substream, 0);
 512		}
 513	}
 514	substream->ops->close(substream);
 515	if (substream->runtime->private_free)
 516		substream->runtime->private_free(substream);
 517	snd_rawmidi_runtime_free(substream);
 518	substream->opened = 0;
 519	substream->append = 0;
 520	put_pid(substream->pid);
 521	substream->pid = NULL;
 522	rmidi->streams[substream->stream].substream_opened--;
 523}
 524
 525static void rawmidi_release_priv(struct snd_rawmidi_file *rfile)
 526{
 527	struct snd_rawmidi *rmidi;
 528
 529	rmidi = rfile->rmidi;
 530	mutex_lock(&rmidi->open_mutex);
 531	if (rfile->input) {
 532		close_substream(rmidi, rfile->input, 1);
 533		rfile->input = NULL;
 534	}
 535	if (rfile->output) {
 536		close_substream(rmidi, rfile->output, 1);
 537		rfile->output = NULL;
 538	}
 539	rfile->rmidi = NULL;
 540	mutex_unlock(&rmidi->open_mutex);
 541	wake_up(&rmidi->open_wait);
 542}
 543
 544/* called from sound/core/seq/seq_midi.c */
 545int snd_rawmidi_kernel_release(struct snd_rawmidi_file *rfile)
 546{
 547	struct snd_rawmidi *rmidi;
 548
 549	if (snd_BUG_ON(!rfile))
 550		return -ENXIO;
 551
 552	rmidi = rfile->rmidi;
 553	rawmidi_release_priv(rfile);
 554	module_put(rmidi->card->module);
 555	return 0;
 556}
 557EXPORT_SYMBOL(snd_rawmidi_kernel_release);
 558
 559static int snd_rawmidi_release(struct inode *inode, struct file *file)
 560{
 561	struct snd_rawmidi_file *rfile;
 562	struct snd_rawmidi *rmidi;
 563	struct module *module;
 564
 565	rfile = file->private_data;
 566	rmidi = rfile->rmidi;
 567	rawmidi_release_priv(rfile);
 568	kfree(rfile);
 569	module = rmidi->card->module;
 570	snd_card_file_remove(rmidi->card, file);
 571	module_put(module);
 572	return 0;
 573}
 574
 575static int snd_rawmidi_info(struct snd_rawmidi_substream *substream,
 576			    struct snd_rawmidi_info *info)
 577{
 578	struct snd_rawmidi *rmidi;
 579
 580	if (substream == NULL)
 581		return -ENODEV;
 582	rmidi = substream->rmidi;
 583	memset(info, 0, sizeof(*info));
 584	info->card = rmidi->card->number;
 585	info->device = rmidi->device;
 586	info->subdevice = substream->number;
 587	info->stream = substream->stream;
 588	info->flags = rmidi->info_flags;
 589	strcpy(info->id, rmidi->id);
 590	strcpy(info->name, rmidi->name);
 591	strcpy(info->subname, substream->name);
 592	info->subdevices_count = substream->pstr->substream_count;
 593	info->subdevices_avail = (substream->pstr->substream_count -
 594				  substream->pstr->substream_opened);
 595	return 0;
 596}
 597
 598static int snd_rawmidi_info_user(struct snd_rawmidi_substream *substream,
 599				 struct snd_rawmidi_info __user *_info)
 600{
 601	struct snd_rawmidi_info info;
 602	int err;
 603
 604	err = snd_rawmidi_info(substream, &info);
 605	if (err < 0)
 606		return err;
 607	if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 608		return -EFAULT;
 609	return 0;
 610}
 611
 612static int __snd_rawmidi_info_select(struct snd_card *card,
 613				     struct snd_rawmidi_info *info)
 614{
 615	struct snd_rawmidi *rmidi;
 616	struct snd_rawmidi_str *pstr;
 617	struct snd_rawmidi_substream *substream;
 618
 
 619	rmidi = snd_rawmidi_search(card, info->device);
 
 620	if (!rmidi)
 621		return -ENXIO;
 622	if (info->stream < 0 || info->stream > 1)
 623		return -EINVAL;
 624	info->stream = array_index_nospec(info->stream, 2);
 625	pstr = &rmidi->streams[info->stream];
 626	if (pstr->substream_count == 0)
 627		return -ENOENT;
 628	if (info->subdevice >= pstr->substream_count)
 629		return -ENXIO;
 630	list_for_each_entry(substream, &pstr->substreams, list) {
 631		if ((unsigned int)substream->number == info->subdevice)
 632			return snd_rawmidi_info(substream, info);
 633	}
 634	return -ENXIO;
 635}
 636
 637int snd_rawmidi_info_select(struct snd_card *card, struct snd_rawmidi_info *info)
 638{
 639	int ret;
 640
 641	mutex_lock(&register_mutex);
 642	ret = __snd_rawmidi_info_select(card, info);
 643	mutex_unlock(&register_mutex);
 644	return ret;
 645}
 646EXPORT_SYMBOL(snd_rawmidi_info_select);
 647
 648static int snd_rawmidi_info_select_user(struct snd_card *card,
 649					struct snd_rawmidi_info __user *_info)
 650{
 651	int err;
 652	struct snd_rawmidi_info info;
 653
 654	if (get_user(info.device, &_info->device))
 655		return -EFAULT;
 656	if (get_user(info.stream, &_info->stream))
 657		return -EFAULT;
 658	if (get_user(info.subdevice, &_info->subdevice))
 659		return -EFAULT;
 660	err = snd_rawmidi_info_select(card, &info);
 661	if (err < 0)
 662		return err;
 663	if (copy_to_user(_info, &info, sizeof(struct snd_rawmidi_info)))
 664		return -EFAULT;
 665	return 0;
 666}
 667
 668static int resize_runtime_buffer(struct snd_rawmidi_runtime *runtime,
 669				 struct snd_rawmidi_params *params,
 670				 bool is_input)
 671{
 672	char *newbuf, *oldbuf;
 673
 674	if (params->buffer_size < 32 || params->buffer_size > 1024L * 1024L)
 
 
 
 
 675		return -EINVAL;
 676	if (params->avail_min < 1 || params->avail_min > params->buffer_size)
 
 677		return -EINVAL;
 
 678	if (params->buffer_size != runtime->buffer_size) {
 679		newbuf = kvzalloc(params->buffer_size, GFP_KERNEL);
 
 680		if (!newbuf)
 681			return -ENOMEM;
 682		spin_lock_irq(&runtime->lock);
 683		if (runtime->buffer_ref) {
 684			spin_unlock_irq(&runtime->lock);
 685			kvfree(newbuf);
 686			return -EBUSY;
 687		}
 688		oldbuf = runtime->buffer;
 689		runtime->buffer = newbuf;
 690		runtime->buffer_size = params->buffer_size;
 691		__reset_runtime_ptrs(runtime, is_input);
 692		spin_unlock_irq(&runtime->lock);
 693		kvfree(oldbuf);
 694	}
 695	runtime->avail_min = params->avail_min;
 
 696	return 0;
 697}
 698
 699int snd_rawmidi_output_params(struct snd_rawmidi_substream *substream,
 700			      struct snd_rawmidi_params *params)
 701{
 702	if (substream->append && substream->use_count > 1)
 703		return -EBUSY;
 704	snd_rawmidi_drain_output(substream);
 705	substream->active_sensing = !params->no_active_sensing;
 706	return resize_runtime_buffer(substream->runtime, params, false);
 707}
 708EXPORT_SYMBOL(snd_rawmidi_output_params);
 709
 710int snd_rawmidi_input_params(struct snd_rawmidi_substream *substream,
 711			     struct snd_rawmidi_params *params)
 712{
 
 
 
 713	snd_rawmidi_drain_input(substream);
 714	return resize_runtime_buffer(substream->runtime, params, true);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 715}
 716EXPORT_SYMBOL(snd_rawmidi_input_params);
 717
 718static int snd_rawmidi_output_status(struct snd_rawmidi_substream *substream,
 719				     struct snd_rawmidi_status64 *status)
 720{
 721	struct snd_rawmidi_runtime *runtime = substream->runtime;
 722
 723	memset(status, 0, sizeof(*status));
 724	status->stream = SNDRV_RAWMIDI_STREAM_OUTPUT;
 725	spin_lock_irq(&runtime->lock);
 726	status->avail = runtime->avail;
 727	spin_unlock_irq(&runtime->lock);
 728	return 0;
 729}
 730
 731static int snd_rawmidi_input_status(struct snd_rawmidi_substream *substream,
 732				    struct snd_rawmidi_status64 *status)
 733{
 734	struct snd_rawmidi_runtime *runtime = substream->runtime;
 735
 736	memset(status, 0, sizeof(*status));
 737	status->stream = SNDRV_RAWMIDI_STREAM_INPUT;
 738	spin_lock_irq(&runtime->lock);
 739	status->avail = runtime->avail;
 740	status->xruns = runtime->xruns;
 741	runtime->xruns = 0;
 742	spin_unlock_irq(&runtime->lock);
 743	return 0;
 744}
 745
 746static int snd_rawmidi_ioctl_status32(struct snd_rawmidi_file *rfile,
 747				      struct snd_rawmidi_status32 __user *argp)
 748{
 749	int err = 0;
 750	struct snd_rawmidi_status32 __user *status = argp;
 751	struct snd_rawmidi_status32 status32;
 752	struct snd_rawmidi_status64 status64;
 753
 754	if (copy_from_user(&status32, argp,
 755			   sizeof(struct snd_rawmidi_status32)))
 756		return -EFAULT;
 757
 758	switch (status32.stream) {
 759	case SNDRV_RAWMIDI_STREAM_OUTPUT:
 760		if (rfile->output == NULL)
 761			return -EINVAL;
 762		err = snd_rawmidi_output_status(rfile->output, &status64);
 763		break;
 764	case SNDRV_RAWMIDI_STREAM_INPUT:
 765		if (rfile->input == NULL)
 766			return -EINVAL;
 767		err = snd_rawmidi_input_status(rfile->input, &status64);
 768		break;
 769	default:
 770		return -EINVAL;
 771	}
 772	if (err < 0)
 773		return err;
 774
 775	status32 = (struct snd_rawmidi_status32) {
 776		.stream = status64.stream,
 777		.tstamp_sec = status64.tstamp_sec,
 778		.tstamp_nsec = status64.tstamp_nsec,
 779		.avail = status64.avail,
 780		.xruns = status64.xruns,
 781	};
 782
 783	if (copy_to_user(status, &status32, sizeof(*status)))
 784		return -EFAULT;
 785
 786	return 0;
 787}
 788
 789static int snd_rawmidi_ioctl_status64(struct snd_rawmidi_file *rfile,
 790				      struct snd_rawmidi_status64 __user *argp)
 791{
 792	int err = 0;
 793	struct snd_rawmidi_status64 status;
 794
 795	if (copy_from_user(&status, argp, sizeof(struct snd_rawmidi_status64)))
 796		return -EFAULT;
 797
 798	switch (status.stream) {
 799	case SNDRV_RAWMIDI_STREAM_OUTPUT:
 800		if (rfile->output == NULL)
 801			return -EINVAL;
 802		err = snd_rawmidi_output_status(rfile->output, &status);
 803		break;
 804	case SNDRV_RAWMIDI_STREAM_INPUT:
 805		if (rfile->input == NULL)
 806			return -EINVAL;
 807		err = snd_rawmidi_input_status(rfile->input, &status);
 808		break;
 809	default:
 810		return -EINVAL;
 811	}
 812	if (err < 0)
 813		return err;
 814	if (copy_to_user(argp, &status,
 815			 sizeof(struct snd_rawmidi_status64)))
 816		return -EFAULT;
 817	return 0;
 818}
 819
 820static long snd_rawmidi_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 821{
 822	struct snd_rawmidi_file *rfile;
 823	void __user *argp = (void __user *)arg;
 824
 825	rfile = file->private_data;
 826	if (((cmd >> 8) & 0xff) != 'W')
 827		return -ENOTTY;
 828	switch (cmd) {
 829	case SNDRV_RAWMIDI_IOCTL_PVERSION:
 830		return put_user(SNDRV_RAWMIDI_VERSION, (int __user *)argp) ? -EFAULT : 0;
 831	case SNDRV_RAWMIDI_IOCTL_INFO:
 832	{
 833		int stream;
 834		struct snd_rawmidi_info __user *info = argp;
 835
 836		if (get_user(stream, &info->stream))
 837			return -EFAULT;
 838		switch (stream) {
 839		case SNDRV_RAWMIDI_STREAM_INPUT:
 840			return snd_rawmidi_info_user(rfile->input, info);
 841		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 842			return snd_rawmidi_info_user(rfile->output, info);
 843		default:
 844			return -EINVAL;
 845		}
 846	}
 847	case SNDRV_RAWMIDI_IOCTL_PARAMS:
 848	{
 849		struct snd_rawmidi_params params;
 850
 851		if (copy_from_user(&params, argp, sizeof(struct snd_rawmidi_params)))
 852			return -EFAULT;
 853		switch (params.stream) {
 854		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 855			if (rfile->output == NULL)
 856				return -EINVAL;
 857			return snd_rawmidi_output_params(rfile->output, &params);
 858		case SNDRV_RAWMIDI_STREAM_INPUT:
 859			if (rfile->input == NULL)
 860				return -EINVAL;
 861			return snd_rawmidi_input_params(rfile->input, &params);
 862		default:
 863			return -EINVAL;
 864		}
 865	}
 866	case SNDRV_RAWMIDI_IOCTL_STATUS32:
 867		return snd_rawmidi_ioctl_status32(rfile, argp);
 868	case SNDRV_RAWMIDI_IOCTL_STATUS64:
 869		return snd_rawmidi_ioctl_status64(rfile, argp);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 870	case SNDRV_RAWMIDI_IOCTL_DROP:
 871	{
 872		int val;
 873
 874		if (get_user(val, (int __user *) argp))
 875			return -EFAULT;
 876		switch (val) {
 877		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 878			if (rfile->output == NULL)
 879				return -EINVAL;
 880			return snd_rawmidi_drop_output(rfile->output);
 881		default:
 882			return -EINVAL;
 883		}
 884	}
 885	case SNDRV_RAWMIDI_IOCTL_DRAIN:
 886	{
 887		int val;
 888
 889		if (get_user(val, (int __user *) argp))
 890			return -EFAULT;
 891		switch (val) {
 892		case SNDRV_RAWMIDI_STREAM_OUTPUT:
 893			if (rfile->output == NULL)
 894				return -EINVAL;
 895			return snd_rawmidi_drain_output(rfile->output);
 896		case SNDRV_RAWMIDI_STREAM_INPUT:
 897			if (rfile->input == NULL)
 898				return -EINVAL;
 899			return snd_rawmidi_drain_input(rfile->input);
 900		default:
 901			return -EINVAL;
 902		}
 903	}
 
 904	default:
 905		rmidi_dbg(rfile->rmidi,
 906			  "rawmidi: unknown command = 0x%x\n", cmd);
 907	}
 908	return -ENOTTY;
 909}
 910
 911static int snd_rawmidi_control_ioctl(struct snd_card *card,
 912				     struct snd_ctl_file *control,
 913				     unsigned int cmd,
 914				     unsigned long arg)
 915{
 916	void __user *argp = (void __user *)arg;
 917
 918	switch (cmd) {
 919	case SNDRV_CTL_IOCTL_RAWMIDI_NEXT_DEVICE:
 920	{
 921		int device;
 922
 923		if (get_user(device, (int __user *)argp))
 924			return -EFAULT;
 925		if (device >= SNDRV_RAWMIDI_DEVICES) /* next device is -1 */
 926			device = SNDRV_RAWMIDI_DEVICES - 1;
 927		mutex_lock(&register_mutex);
 928		device = device < 0 ? 0 : device + 1;
 929		while (device < SNDRV_RAWMIDI_DEVICES) {
 930			if (snd_rawmidi_search(card, device))
 931				break;
 932			device++;
 933		}
 934		if (device == SNDRV_RAWMIDI_DEVICES)
 935			device = -1;
 936		mutex_unlock(&register_mutex);
 937		if (put_user(device, (int __user *)argp))
 938			return -EFAULT;
 939		return 0;
 940	}
 941	case SNDRV_CTL_IOCTL_RAWMIDI_PREFER_SUBDEVICE:
 942	{
 943		int val;
 944
 945		if (get_user(val, (int __user *)argp))
 946			return -EFAULT;
 947		control->preferred_subdevice[SND_CTL_SUBDEV_RAWMIDI] = val;
 948		return 0;
 949	}
 950	case SNDRV_CTL_IOCTL_RAWMIDI_INFO:
 951		return snd_rawmidi_info_select_user(card, argp);
 952	}
 953	return -ENOIOCTLCMD;
 954}
 955
 956/**
 957 * snd_rawmidi_receive - receive the input data from the device
 958 * @substream: the rawmidi substream
 959 * @buffer: the buffer pointer
 960 * @count: the data size to read
 961 *
 962 * Reads the data from the internal buffer.
 963 *
 964 * Return: The size of read data, or a negative error code on failure.
 965 */
 966int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 967			const unsigned char *buffer, int count)
 968{
 969	unsigned long flags;
 970	int result = 0, count1;
 971	struct snd_rawmidi_runtime *runtime = substream->runtime;
 972
 973	if (!substream->opened)
 974		return -EBADFD;
 975	if (runtime->buffer == NULL) {
 976		rmidi_dbg(substream->rmidi,
 977			  "snd_rawmidi_receive: input is not active!!!\n");
 978		return -EINVAL;
 979	}
 980	spin_lock_irqsave(&runtime->lock, flags);
 981	if (count == 1) {	/* special case, faster code */
 982		substream->bytes++;
 983		if (runtime->avail < runtime->buffer_size) {
 984			runtime->buffer[runtime->hw_ptr++] = buffer[0];
 985			runtime->hw_ptr %= runtime->buffer_size;
 986			runtime->avail++;
 987			result++;
 988		} else {
 989			runtime->xruns++;
 990		}
 991	} else {
 992		substream->bytes += count;
 993		count1 = runtime->buffer_size - runtime->hw_ptr;
 994		if (count1 > count)
 995			count1 = count;
 996		if (count1 > (int)(runtime->buffer_size - runtime->avail))
 997			count1 = runtime->buffer_size - runtime->avail;
 998		memcpy(runtime->buffer + runtime->hw_ptr, buffer, count1);
 999		runtime->hw_ptr += count1;
1000		runtime->hw_ptr %= runtime->buffer_size;
1001		runtime->avail += count1;
1002		count -= count1;
1003		result += count1;
1004		if (count > 0) {
1005			buffer += count1;
1006			count1 = count;
1007			if (count1 > (int)(runtime->buffer_size - runtime->avail)) {
1008				count1 = runtime->buffer_size - runtime->avail;
1009				runtime->xruns += count - count1;
1010			}
1011			if (count1 > 0) {
1012				memcpy(runtime->buffer, buffer, count1);
1013				runtime->hw_ptr = count1;
1014				runtime->avail += count1;
1015				result += count1;
1016			}
1017		}
1018	}
1019	if (result > 0) {
1020		if (runtime->event)
1021			schedule_work(&runtime->event_work);
1022		else if (snd_rawmidi_ready(substream))
1023			wake_up(&runtime->sleep);
1024	}
1025	spin_unlock_irqrestore(&runtime->lock, flags);
1026	return result;
1027}
1028EXPORT_SYMBOL(snd_rawmidi_receive);
1029
1030static long snd_rawmidi_kernel_read1(struct snd_rawmidi_substream *substream,
1031				     unsigned char __user *userbuf,
1032				     unsigned char *kernelbuf, long count)
1033{
1034	unsigned long flags;
1035	long result = 0, count1;
1036	struct snd_rawmidi_runtime *runtime = substream->runtime;
1037	unsigned long appl_ptr;
1038	int err = 0;
1039
1040	spin_lock_irqsave(&runtime->lock, flags);
1041	snd_rawmidi_buffer_ref(runtime);
1042	while (count > 0 && runtime->avail) {
1043		count1 = runtime->buffer_size - runtime->appl_ptr;
1044		if (count1 > count)
1045			count1 = count;
 
1046		if (count1 > (int)runtime->avail)
1047			count1 = runtime->avail;
1048
1049		/* update runtime->appl_ptr before unlocking for userbuf */
1050		appl_ptr = runtime->appl_ptr;
1051		runtime->appl_ptr += count1;
1052		runtime->appl_ptr %= runtime->buffer_size;
1053		runtime->avail -= count1;
1054
1055		if (kernelbuf)
1056			memcpy(kernelbuf + result, runtime->buffer + appl_ptr, count1);
1057		if (userbuf) {
1058			spin_unlock_irqrestore(&runtime->lock, flags);
1059			if (copy_to_user(userbuf + result,
1060					 runtime->buffer + appl_ptr, count1))
1061				err = -EFAULT;
 
1062			spin_lock_irqsave(&runtime->lock, flags);
1063			if (err)
1064				goto out;
1065		}
 
 
 
 
1066		result += count1;
1067		count -= count1;
1068	}
1069 out:
1070	snd_rawmidi_buffer_unref(runtime);
1071	spin_unlock_irqrestore(&runtime->lock, flags);
1072	return result > 0 ? result : err;
1073}
1074
1075long snd_rawmidi_kernel_read(struct snd_rawmidi_substream *substream,
1076			     unsigned char *buf, long count)
1077{
1078	snd_rawmidi_input_trigger(substream, 1);
1079	return snd_rawmidi_kernel_read1(substream, NULL/*userbuf*/, buf, count);
1080}
1081EXPORT_SYMBOL(snd_rawmidi_kernel_read);
1082
1083static ssize_t snd_rawmidi_read(struct file *file, char __user *buf, size_t count,
1084				loff_t *offset)
1085{
1086	long result;
1087	int count1;
1088	struct snd_rawmidi_file *rfile;
1089	struct snd_rawmidi_substream *substream;
1090	struct snd_rawmidi_runtime *runtime;
1091
1092	rfile = file->private_data;
1093	substream = rfile->input;
1094	if (substream == NULL)
1095		return -EIO;
1096	runtime = substream->runtime;
1097	snd_rawmidi_input_trigger(substream, 1);
1098	result = 0;
1099	while (count > 0) {
1100		spin_lock_irq(&runtime->lock);
1101		while (!snd_rawmidi_ready(substream)) {
1102			wait_queue_entry_t wait;
1103
1104			if ((file->f_flags & O_NONBLOCK) != 0 || result > 0) {
1105				spin_unlock_irq(&runtime->lock);
1106				return result > 0 ? result : -EAGAIN;
1107			}
1108			init_waitqueue_entry(&wait, current);
1109			add_wait_queue(&runtime->sleep, &wait);
1110			set_current_state(TASK_INTERRUPTIBLE);
1111			spin_unlock_irq(&runtime->lock);
1112			schedule();
1113			remove_wait_queue(&runtime->sleep, &wait);
1114			if (rfile->rmidi->card->shutdown)
1115				return -ENODEV;
1116			if (signal_pending(current))
1117				return result > 0 ? result : -ERESTARTSYS;
1118			if (!runtime->avail)
1119				return result > 0 ? result : -EIO;
1120			spin_lock_irq(&runtime->lock);
1121		}
1122		spin_unlock_irq(&runtime->lock);
1123		count1 = snd_rawmidi_kernel_read1(substream,
1124						  (unsigned char __user *)buf,
1125						  NULL/*kernelbuf*/,
1126						  count);
1127		if (count1 < 0)
1128			return result > 0 ? result : count1;
1129		result += count1;
1130		buf += count1;
1131		count -= count1;
1132	}
1133	return result;
1134}
1135
1136/**
1137 * snd_rawmidi_transmit_empty - check whether the output buffer is empty
1138 * @substream: the rawmidi substream
1139 *
1140 * Return: 1 if the internal output buffer is empty, 0 if not.
1141 */
1142int snd_rawmidi_transmit_empty(struct snd_rawmidi_substream *substream)
1143{
1144	struct snd_rawmidi_runtime *runtime = substream->runtime;
1145	int result;
1146	unsigned long flags;
1147
1148	if (runtime->buffer == NULL) {
1149		rmidi_dbg(substream->rmidi,
1150			  "snd_rawmidi_transmit_empty: output is not active!!!\n");
1151		return 1;
1152	}
1153	spin_lock_irqsave(&runtime->lock, flags);
1154	result = runtime->avail >= runtime->buffer_size;
1155	spin_unlock_irqrestore(&runtime->lock, flags);
1156	return result;
1157}
1158EXPORT_SYMBOL(snd_rawmidi_transmit_empty);
1159
1160/**
1161 * __snd_rawmidi_transmit_peek - copy data from the internal buffer
1162 * @substream: the rawmidi substream
1163 * @buffer: the buffer pointer
1164 * @count: data size to transfer
1165 *
1166 * This is a variant of snd_rawmidi_transmit_peek() without spinlock.
 
 
 
 
 
 
1167 */
1168int __snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1169			      unsigned char *buffer, int count)
1170{
 
1171	int result, count1;
1172	struct snd_rawmidi_runtime *runtime = substream->runtime;
1173
1174	if (runtime->buffer == NULL) {
1175		rmidi_dbg(substream->rmidi,
1176			  "snd_rawmidi_transmit_peek: output is not active!!!\n");
1177		return -EINVAL;
1178	}
1179	result = 0;
 
1180	if (runtime->avail >= runtime->buffer_size) {
1181		/* warning: lowlevel layer MUST trigger down the hardware */
1182		goto __skip;
1183	}
1184	if (count == 1) {	/* special case, faster code */
1185		*buffer = runtime->buffer[runtime->hw_ptr];
1186		result++;
1187	} else {
1188		count1 = runtime->buffer_size - runtime->hw_ptr;
1189		if (count1 > count)
1190			count1 = count;
1191		if (count1 > (int)(runtime->buffer_size - runtime->avail))
1192			count1 = runtime->buffer_size - runtime->avail;
1193		memcpy(buffer, runtime->buffer + runtime->hw_ptr, count1);
1194		count -= count1;
1195		result += count1;
1196		if (count > 0) {
1197			if (count > (int)(runtime->buffer_size - runtime->avail - count1))
1198				count = runtime->buffer_size - runtime->avail - count1;
1199			memcpy(buffer + count1, runtime->buffer, count);
1200			result += count;
1201		}
1202	}
1203      __skip:
 
1204	return result;
1205}
1206EXPORT_SYMBOL(__snd_rawmidi_transmit_peek);
1207
1208/**
1209 * snd_rawmidi_transmit_peek - copy data from the internal buffer
1210 * @substream: the rawmidi substream
1211 * @buffer: the buffer pointer
1212 * @count: data size to transfer
1213 *
1214 * Copies data from the internal output buffer to the given buffer.
1215 *
1216 * Call this in the interrupt handler when the midi output is ready,
1217 * and call snd_rawmidi_transmit_ack() after the transmission is
1218 * finished.
1219 *
1220 * Return: The size of copied data, or a negative error code on failure.
1221 */
1222int snd_rawmidi_transmit_peek(struct snd_rawmidi_substream *substream,
1223			      unsigned char *buffer, int count)
1224{
1225	struct snd_rawmidi_runtime *runtime = substream->runtime;
1226	int result;
1227	unsigned long flags;
1228
1229	spin_lock_irqsave(&runtime->lock, flags);
1230	result = __snd_rawmidi_transmit_peek(substream, buffer, count);
1231	spin_unlock_irqrestore(&runtime->lock, flags);
1232	return result;
1233}
1234EXPORT_SYMBOL(snd_rawmidi_transmit_peek);
1235
1236/**
1237 * __snd_rawmidi_transmit_ack - acknowledge the transmission
1238 * @substream: the rawmidi substream
1239 * @count: the transferred count
1240 *
1241 * This is a variant of __snd_rawmidi_transmit_ack() without spinlock.
1242 */
1243int __snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1244{
1245	struct snd_rawmidi_runtime *runtime = substream->runtime;
1246
1247	if (runtime->buffer == NULL) {
1248		rmidi_dbg(substream->rmidi,
1249			  "snd_rawmidi_transmit_ack: output is not active!!!\n");
1250		return -EINVAL;
1251	}
 
1252	snd_BUG_ON(runtime->avail + count > runtime->buffer_size);
1253	runtime->hw_ptr += count;
1254	runtime->hw_ptr %= runtime->buffer_size;
1255	runtime->avail += count;
1256	substream->bytes += count;
1257	if (count > 0) {
1258		if (runtime->drain || snd_rawmidi_ready(substream))
1259			wake_up(&runtime->sleep);
1260	}
1261	return count;
1262}
1263EXPORT_SYMBOL(__snd_rawmidi_transmit_ack);
1264
1265/**
1266 * snd_rawmidi_transmit_ack - acknowledge the transmission
1267 * @substream: the rawmidi substream
1268 * @count: the transferred count
1269 *
1270 * Advances the hardware pointer for the internal output buffer with
1271 * the given size and updates the condition.
1272 * Call after the transmission is finished.
1273 *
1274 * Return: The advanced size if successful, or a negative error code on failure.
1275 */
1276int snd_rawmidi_transmit_ack(struct snd_rawmidi_substream *substream, int count)
1277{
1278	struct snd_rawmidi_runtime *runtime = substream->runtime;
1279	int result;
1280	unsigned long flags;
1281
1282	spin_lock_irqsave(&runtime->lock, flags);
1283	result = __snd_rawmidi_transmit_ack(substream, count);
1284	spin_unlock_irqrestore(&runtime->lock, flags);
1285	return result;
1286}
1287EXPORT_SYMBOL(snd_rawmidi_transmit_ack);
1288
1289/**
1290 * snd_rawmidi_transmit - copy from the buffer to the device
1291 * @substream: the rawmidi substream
1292 * @buffer: the buffer pointer
1293 * @count: the data size to transfer
1294 *
1295 * Copies data from the buffer to the device and advances the pointer.
1296 *
1297 * Return: The copied size if successful, or a negative error code on failure.
1298 */
1299int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
1300			 unsigned char *buffer, int count)
1301{
1302	struct snd_rawmidi_runtime *runtime = substream->runtime;
1303	int result;
1304	unsigned long flags;
1305
1306	spin_lock_irqsave(&runtime->lock, flags);
1307	if (!substream->opened)
1308		result = -EBADFD;
1309	else {
1310		count = __snd_rawmidi_transmit_peek(substream, buffer, count);
1311		if (count <= 0)
1312			result = count;
1313		else
1314			result = __snd_rawmidi_transmit_ack(substream, count);
1315	}
1316	spin_unlock_irqrestore(&runtime->lock, flags);
1317	return result;
1318}
1319EXPORT_SYMBOL(snd_rawmidi_transmit);
1320
1321/**
1322 * snd_rawmidi_proceed - Discard the all pending bytes and proceed
1323 * @substream: rawmidi substream
1324 *
1325 * Return: the number of discarded bytes
1326 */
1327int snd_rawmidi_proceed(struct snd_rawmidi_substream *substream)
1328{
1329	struct snd_rawmidi_runtime *runtime = substream->runtime;
1330	unsigned long flags;
1331	int count = 0;
1332
1333	spin_lock_irqsave(&runtime->lock, flags);
1334	if (runtime->avail < runtime->buffer_size) {
1335		count = runtime->buffer_size - runtime->avail;
1336		__snd_rawmidi_transmit_ack(substream, count);
1337	}
1338	spin_unlock_irqrestore(&runtime->lock, flags);
1339	return count;
1340}
1341EXPORT_SYMBOL(snd_rawmidi_proceed);
1342
1343static long snd_rawmidi_kernel_write1(struct snd_rawmidi_substream *substream,
1344				      const unsigned char __user *userbuf,
1345				      const unsigned char *kernelbuf,
1346				      long count)
1347{
1348	unsigned long flags;
1349	long count1, result;
1350	struct snd_rawmidi_runtime *runtime = substream->runtime;
1351	unsigned long appl_ptr;
1352
1353	if (!kernelbuf && !userbuf)
1354		return -EINVAL;
1355	if (snd_BUG_ON(!runtime->buffer))
1356		return -EINVAL;
1357
1358	result = 0;
1359	spin_lock_irqsave(&runtime->lock, flags);
1360	if (substream->append) {
1361		if ((long)runtime->avail < count) {
1362			spin_unlock_irqrestore(&runtime->lock, flags);
1363			return -EAGAIN;
1364		}
1365	}
1366	snd_rawmidi_buffer_ref(runtime);
1367	while (count > 0 && runtime->avail > 0) {
1368		count1 = runtime->buffer_size - runtime->appl_ptr;
1369		if (count1 > count)
1370			count1 = count;
1371		if (count1 > (long)runtime->avail)
1372			count1 = runtime->avail;
1373
1374		/* update runtime->appl_ptr before unlocking for userbuf */
1375		appl_ptr = runtime->appl_ptr;
1376		runtime->appl_ptr += count1;
1377		runtime->appl_ptr %= runtime->buffer_size;
1378		runtime->avail -= count1;
1379
1380		if (kernelbuf)
1381			memcpy(runtime->buffer + appl_ptr,
1382			       kernelbuf + result, count1);
1383		else if (userbuf) {
1384			spin_unlock_irqrestore(&runtime->lock, flags);
1385			if (copy_from_user(runtime->buffer + appl_ptr,
1386					   userbuf + result, count1)) {
1387				spin_lock_irqsave(&runtime->lock, flags);
1388				result = result > 0 ? result : -EFAULT;
1389				goto __end;
1390			}
1391			spin_lock_irqsave(&runtime->lock, flags);
1392		}
 
 
 
1393		result += count1;
1394		count -= count1;
1395	}
1396      __end:
1397	count1 = runtime->avail < runtime->buffer_size;
1398	snd_rawmidi_buffer_unref(runtime);
1399	spin_unlock_irqrestore(&runtime->lock, flags);
1400	if (count1)
1401		snd_rawmidi_output_trigger(substream, 1);
1402	return result;
1403}
1404
1405long snd_rawmidi_kernel_write(struct snd_rawmidi_substream *substream,
1406			      const unsigned char *buf, long count)
1407{
1408	return snd_rawmidi_kernel_write1(substream, NULL, buf, count);
1409}
1410EXPORT_SYMBOL(snd_rawmidi_kernel_write);
1411
1412static ssize_t snd_rawmidi_write(struct file *file, const char __user *buf,
1413				 size_t count, loff_t *offset)
1414{
1415	long result, timeout;
1416	int count1;
1417	struct snd_rawmidi_file *rfile;
1418	struct snd_rawmidi_runtime *runtime;
1419	struct snd_rawmidi_substream *substream;
1420
1421	rfile = file->private_data;
1422	substream = rfile->output;
1423	runtime = substream->runtime;
1424	/* we cannot put an atomic message to our buffer */
1425	if (substream->append && count > runtime->buffer_size)
1426		return -EIO;
1427	result = 0;
1428	while (count > 0) {
1429		spin_lock_irq(&runtime->lock);
1430		while (!snd_rawmidi_ready_append(substream, count)) {
1431			wait_queue_entry_t wait;
1432
1433			if (file->f_flags & O_NONBLOCK) {
1434				spin_unlock_irq(&runtime->lock);
1435				return result > 0 ? result : -EAGAIN;
1436			}
1437			init_waitqueue_entry(&wait, current);
1438			add_wait_queue(&runtime->sleep, &wait);
1439			set_current_state(TASK_INTERRUPTIBLE);
1440			spin_unlock_irq(&runtime->lock);
1441			timeout = schedule_timeout(30 * HZ);
1442			remove_wait_queue(&runtime->sleep, &wait);
1443			if (rfile->rmidi->card->shutdown)
1444				return -ENODEV;
1445			if (signal_pending(current))
1446				return result > 0 ? result : -ERESTARTSYS;
1447			if (!runtime->avail && !timeout)
1448				return result > 0 ? result : -EIO;
1449			spin_lock_irq(&runtime->lock);
1450		}
1451		spin_unlock_irq(&runtime->lock);
1452		count1 = snd_rawmidi_kernel_write1(substream, buf, NULL, count);
1453		if (count1 < 0)
1454			return result > 0 ? result : count1;
1455		result += count1;
1456		buf += count1;
1457		if ((size_t)count1 < count && (file->f_flags & O_NONBLOCK))
1458			break;
1459		count -= count1;
1460	}
1461	if (file->f_flags & O_DSYNC) {
1462		spin_lock_irq(&runtime->lock);
1463		while (runtime->avail != runtime->buffer_size) {
1464			wait_queue_entry_t wait;
1465			unsigned int last_avail = runtime->avail;
1466
1467			init_waitqueue_entry(&wait, current);
1468			add_wait_queue(&runtime->sleep, &wait);
1469			set_current_state(TASK_INTERRUPTIBLE);
1470			spin_unlock_irq(&runtime->lock);
1471			timeout = schedule_timeout(30 * HZ);
1472			remove_wait_queue(&runtime->sleep, &wait);
1473			if (signal_pending(current))
1474				return result > 0 ? result : -ERESTARTSYS;
1475			if (runtime->avail == last_avail && !timeout)
1476				return result > 0 ? result : -EIO;
1477			spin_lock_irq(&runtime->lock);
1478		}
1479		spin_unlock_irq(&runtime->lock);
1480	}
1481	return result;
1482}
1483
1484static __poll_t snd_rawmidi_poll(struct file *file, poll_table *wait)
1485{
1486	struct snd_rawmidi_file *rfile;
1487	struct snd_rawmidi_runtime *runtime;
1488	__poll_t mask;
1489
1490	rfile = file->private_data;
1491	if (rfile->input != NULL) {
1492		runtime = rfile->input->runtime;
1493		snd_rawmidi_input_trigger(rfile->input, 1);
1494		poll_wait(file, &runtime->sleep, wait);
1495	}
1496	if (rfile->output != NULL) {
1497		runtime = rfile->output->runtime;
1498		poll_wait(file, &runtime->sleep, wait);
1499	}
1500	mask = 0;
1501	if (rfile->input != NULL) {
1502		if (snd_rawmidi_ready(rfile->input))
1503			mask |= EPOLLIN | EPOLLRDNORM;
1504	}
1505	if (rfile->output != NULL) {
1506		if (snd_rawmidi_ready(rfile->output))
1507			mask |= EPOLLOUT | EPOLLWRNORM;
1508	}
1509	return mask;
1510}
1511
1512/*
1513 */
1514#ifdef CONFIG_COMPAT
1515#include "rawmidi_compat.c"
1516#else
1517#define snd_rawmidi_ioctl_compat	NULL
1518#endif
1519
1520/*
 
1521 */
1522
1523static void snd_rawmidi_proc_info_read(struct snd_info_entry *entry,
1524				       struct snd_info_buffer *buffer)
1525{
1526	struct snd_rawmidi *rmidi;
1527	struct snd_rawmidi_substream *substream;
1528	struct snd_rawmidi_runtime *runtime;
1529
1530	rmidi = entry->private_data;
1531	snd_iprintf(buffer, "%s\n\n", rmidi->name);
1532	mutex_lock(&rmidi->open_mutex);
1533	if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_OUTPUT) {
1534		list_for_each_entry(substream,
1535				    &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams,
1536				    list) {
1537			snd_iprintf(buffer,
1538				    "Output %d\n"
1539				    "  Tx bytes     : %lu\n",
1540				    substream->number,
1541				    (unsigned long) substream->bytes);
1542			if (substream->opened) {
1543				snd_iprintf(buffer,
1544				    "  Owner PID    : %d\n",
1545				    pid_vnr(substream->pid));
1546				runtime = substream->runtime;
1547				snd_iprintf(buffer,
1548				    "  Mode         : %s\n"
1549				    "  Buffer size  : %lu\n"
1550				    "  Avail        : %lu\n",
1551				    runtime->oss ? "OSS compatible" : "native",
1552				    (unsigned long) runtime->buffer_size,
1553				    (unsigned long) runtime->avail);
1554			}
1555		}
1556	}
1557	if (rmidi->info_flags & SNDRV_RAWMIDI_INFO_INPUT) {
1558		list_for_each_entry(substream,
1559				    &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams,
1560				    list) {
1561			snd_iprintf(buffer,
1562				    "Input %d\n"
1563				    "  Rx bytes     : %lu\n",
1564				    substream->number,
1565				    (unsigned long) substream->bytes);
1566			if (substream->opened) {
1567				snd_iprintf(buffer,
1568					    "  Owner PID    : %d\n",
1569					    pid_vnr(substream->pid));
1570				runtime = substream->runtime;
1571				snd_iprintf(buffer,
1572					    "  Buffer size  : %lu\n"
1573					    "  Avail        : %lu\n"
1574					    "  Overruns     : %lu\n",
1575					    (unsigned long) runtime->buffer_size,
1576					    (unsigned long) runtime->avail,
1577					    (unsigned long) runtime->xruns);
1578			}
1579		}
1580	}
1581	mutex_unlock(&rmidi->open_mutex);
1582}
1583
1584/*
1585 *  Register functions
1586 */
1587
1588static const struct file_operations snd_rawmidi_f_ops = {
 
1589	.owner =	THIS_MODULE,
1590	.read =		snd_rawmidi_read,
1591	.write =	snd_rawmidi_write,
1592	.open =		snd_rawmidi_open,
1593	.release =	snd_rawmidi_release,
1594	.llseek =	no_llseek,
1595	.poll =		snd_rawmidi_poll,
1596	.unlocked_ioctl =	snd_rawmidi_ioctl,
1597	.compat_ioctl =	snd_rawmidi_ioctl_compat,
1598};
1599
1600static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
1601					struct snd_rawmidi_str *stream,
1602					int direction,
1603					int count)
1604{
1605	struct snd_rawmidi_substream *substream;
1606	int idx;
1607
1608	for (idx = 0; idx < count; idx++) {
1609		substream = kzalloc(sizeof(*substream), GFP_KERNEL);
1610		if (!substream)
 
1611			return -ENOMEM;
 
1612		substream->stream = direction;
1613		substream->number = idx;
1614		substream->rmidi = rmidi;
1615		substream->pstr = stream;
1616		list_add_tail(&substream->list, &stream->substreams);
1617		stream->substream_count++;
1618	}
1619	return 0;
1620}
1621
1622static void release_rawmidi_device(struct device *dev)
1623{
1624	kfree(container_of(dev, struct snd_rawmidi, dev));
1625}
1626
1627/**
1628 * snd_rawmidi_new - create a rawmidi instance
1629 * @card: the card instance
1630 * @id: the id string
1631 * @device: the device index
1632 * @output_count: the number of output streams
1633 * @input_count: the number of input streams
1634 * @rrawmidi: the pointer to store the new rawmidi instance
1635 *
1636 * Creates a new rawmidi instance.
1637 * Use snd_rawmidi_set_ops() to set the operators to the new instance.
1638 *
1639 * Return: Zero if successful, or a negative error code on failure.
1640 */
1641int snd_rawmidi_new(struct snd_card *card, char *id, int device,
1642		    int output_count, int input_count,
1643		    struct snd_rawmidi **rrawmidi)
1644{
1645	struct snd_rawmidi *rmidi;
1646	int err;
1647	static const struct snd_device_ops ops = {
1648		.dev_free = snd_rawmidi_dev_free,
1649		.dev_register = snd_rawmidi_dev_register,
1650		.dev_disconnect = snd_rawmidi_dev_disconnect,
1651	};
1652
1653	if (snd_BUG_ON(!card))
1654		return -ENXIO;
1655	if (rrawmidi)
1656		*rrawmidi = NULL;
1657	rmidi = kzalloc(sizeof(*rmidi), GFP_KERNEL);
1658	if (!rmidi)
 
1659		return -ENOMEM;
 
1660	rmidi->card = card;
1661	rmidi->device = device;
1662	mutex_init(&rmidi->open_mutex);
1663	init_waitqueue_head(&rmidi->open_wait);
1664	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT].substreams);
1665	INIT_LIST_HEAD(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT].substreams);
1666
1667	if (id != NULL)
1668		strlcpy(rmidi->id, id, sizeof(rmidi->id));
1669
1670	snd_device_initialize(&rmidi->dev, card);
1671	rmidi->dev.release = release_rawmidi_device;
1672	dev_set_name(&rmidi->dev, "midiC%iD%i", card->number, device);
1673
1674	err = snd_rawmidi_alloc_substreams(rmidi,
1675					   &rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT],
1676					   SNDRV_RAWMIDI_STREAM_INPUT,
1677					   input_count);
1678	if (err < 0)
1679		goto error;
1680	err = snd_rawmidi_alloc_substreams(rmidi,
1681					   &rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT],
1682					   SNDRV_RAWMIDI_STREAM_OUTPUT,
1683					   output_count);
1684	if (err < 0)
1685		goto error;
1686	err = snd_device_new(card, SNDRV_DEV_RAWMIDI, rmidi, &ops);
1687	if (err < 0)
1688		goto error;
1689
1690	if (rrawmidi)
1691		*rrawmidi = rmidi;
1692	return 0;
1693
1694 error:
1695	snd_rawmidi_free(rmidi);
1696	return err;
1697}
1698EXPORT_SYMBOL(snd_rawmidi_new);
1699
1700static void snd_rawmidi_free_substreams(struct snd_rawmidi_str *stream)
1701{
1702	struct snd_rawmidi_substream *substream;
1703
1704	while (!list_empty(&stream->substreams)) {
1705		substream = list_entry(stream->substreams.next, struct snd_rawmidi_substream, list);
1706		list_del(&substream->list);
1707		kfree(substream);
1708	}
1709}
1710
1711static int snd_rawmidi_free(struct snd_rawmidi *rmidi)
1712{
1713	if (!rmidi)
1714		return 0;
1715
1716	snd_info_free_entry(rmidi->proc_entry);
1717	rmidi->proc_entry = NULL;
1718	mutex_lock(&register_mutex);
1719	if (rmidi->ops && rmidi->ops->dev_unregister)
1720		rmidi->ops->dev_unregister(rmidi);
1721	mutex_unlock(&register_mutex);
1722
1723	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]);
1724	snd_rawmidi_free_substreams(&rmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]);
1725	if (rmidi->private_free)
1726		rmidi->private_free(rmidi);
1727	put_device(&rmidi->dev);
1728	return 0;
1729}
1730
1731static int snd_rawmidi_dev_free(struct snd_device *device)
1732{
1733	struct snd_rawmidi *rmidi = device->device_data;
1734
1735	return snd_rawmidi_free(rmidi);
1736}
1737
1738#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1739static void snd_rawmidi_dev_seq_free(struct snd_seq_device *device)
1740{
1741	struct snd_rawmidi *rmidi = device->private_data;
1742
1743	rmidi->seq_dev = NULL;
1744}
1745#endif
1746
1747static int snd_rawmidi_dev_register(struct snd_device *device)
1748{
1749	int err;
1750	struct snd_info_entry *entry;
1751	char name[16];
1752	struct snd_rawmidi *rmidi = device->device_data;
1753
1754	if (rmidi->device >= SNDRV_RAWMIDI_DEVICES)
1755		return -ENOMEM;
1756	err = 0;
1757	mutex_lock(&register_mutex);
1758	if (snd_rawmidi_search(rmidi->card, rmidi->device))
1759		err = -EBUSY;
1760	else
1761		list_add_tail(&rmidi->list, &snd_rawmidi_devices);
1762	mutex_unlock(&register_mutex);
1763	if (err < 0)
 
 
 
 
 
 
1764		return err;
1765
1766	err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
1767				  rmidi->card, rmidi->device,
1768				  &snd_rawmidi_f_ops, rmidi, &rmidi->dev);
1769	if (err < 0) {
1770		rmidi_err(rmidi, "unable to register\n");
1771		goto error;
1772	}
1773	if (rmidi->ops && rmidi->ops->dev_register) {
1774		err = rmidi->ops->dev_register(rmidi);
1775		if (err < 0)
1776			goto error_unregister;
 
 
1777	}
1778#ifdef CONFIG_SND_OSSEMUL
1779	rmidi->ossreg = 0;
1780	if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1781		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1782					    rmidi->card, 0, &snd_rawmidi_f_ops,
1783					    rmidi) < 0) {
1784			rmidi_err(rmidi,
1785				  "unable to register OSS rawmidi device %i:%i\n",
1786				  rmidi->card->number, 0);
1787		} else {
1788			rmidi->ossreg++;
1789#ifdef SNDRV_OSS_INFO_DEV_MIDI
1790			snd_oss_info_register(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number, rmidi->name);
1791#endif
1792		}
1793	}
1794	if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
1795		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
1796					    rmidi->card, 1, &snd_rawmidi_f_ops,
1797					    rmidi) < 0) {
1798			rmidi_err(rmidi,
1799				  "unable to register OSS rawmidi device %i:%i\n",
1800				  rmidi->card->number, 1);
1801		} else {
1802			rmidi->ossreg++;
1803		}
1804	}
1805#endif /* CONFIG_SND_OSSEMUL */
 
1806	sprintf(name, "midi%d", rmidi->device);
1807	entry = snd_info_create_card_entry(rmidi->card, name, rmidi->card->proc_root);
1808	if (entry) {
1809		entry->private_data = rmidi;
1810		entry->c.text.read = snd_rawmidi_proc_info_read;
1811		if (snd_info_register(entry) < 0) {
1812			snd_info_free_entry(entry);
1813			entry = NULL;
1814		}
1815	}
1816	rmidi->proc_entry = entry;
1817#if IS_ENABLED(CONFIG_SND_SEQUENCER)
1818	if (!rmidi->ops || !rmidi->ops->dev_register) { /* own registration mechanism */
1819		if (snd_seq_device_new(rmidi->card, rmidi->device, SNDRV_SEQ_DEV_ID_MIDISYNTH, 0, &rmidi->seq_dev) >= 0) {
1820			rmidi->seq_dev->private_data = rmidi;
1821			rmidi->seq_dev->private_free = snd_rawmidi_dev_seq_free;
1822			sprintf(rmidi->seq_dev->name, "MIDI %d-%d", rmidi->card->number, rmidi->device);
1823			snd_device_register(rmidi->card, rmidi->seq_dev);
1824		}
1825	}
1826#endif
1827	return 0;
1828
1829 error_unregister:
1830	snd_unregister_device(&rmidi->dev);
1831 error:
1832	mutex_lock(&register_mutex);
1833	list_del(&rmidi->list);
1834	mutex_unlock(&register_mutex);
1835	return err;
1836}
1837
1838static int snd_rawmidi_dev_disconnect(struct snd_device *device)
1839{
1840	struct snd_rawmidi *rmidi = device->device_data;
1841	int dir;
1842
1843	mutex_lock(&register_mutex);
1844	mutex_lock(&rmidi->open_mutex);
1845	wake_up(&rmidi->open_wait);
1846	list_del_init(&rmidi->list);
1847	for (dir = 0; dir < 2; dir++) {
1848		struct snd_rawmidi_substream *s;
1849
1850		list_for_each_entry(s, &rmidi->streams[dir].substreams, list) {
1851			if (s->runtime)
1852				wake_up(&s->runtime->sleep);
1853		}
1854	}
1855
1856#ifdef CONFIG_SND_OSSEMUL
1857	if (rmidi->ossreg) {
1858		if ((int)rmidi->device == midi_map[rmidi->card->number]) {
1859			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 0);
1860#ifdef SNDRV_OSS_INFO_DEV_MIDI
1861			snd_oss_info_unregister(SNDRV_OSS_INFO_DEV_MIDI, rmidi->card->number);
1862#endif
1863		}
1864		if ((int)rmidi->device == amidi_map[rmidi->card->number])
1865			snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI, rmidi->card, 1);
1866		rmidi->ossreg = 0;
1867	}
1868#endif /* CONFIG_SND_OSSEMUL */
1869	snd_unregister_device(&rmidi->dev);
1870	mutex_unlock(&rmidi->open_mutex);
1871	mutex_unlock(&register_mutex);
1872	return 0;
1873}
1874
1875/**
1876 * snd_rawmidi_set_ops - set the rawmidi operators
1877 * @rmidi: the rawmidi instance
1878 * @stream: the stream direction, SNDRV_RAWMIDI_STREAM_XXX
1879 * @ops: the operator table
1880 *
1881 * Sets the rawmidi operators for the given stream direction.
1882 */
1883void snd_rawmidi_set_ops(struct snd_rawmidi *rmidi, int stream,
1884			 const struct snd_rawmidi_ops *ops)
1885{
1886	struct snd_rawmidi_substream *substream;
1887
1888	list_for_each_entry(substream, &rmidi->streams[stream].substreams, list)
1889		substream->ops = ops;
1890}
1891EXPORT_SYMBOL(snd_rawmidi_set_ops);
1892
1893/*
1894 *  ENTRY functions
1895 */
1896
1897static int __init alsa_rawmidi_init(void)
1898{
1899
1900	snd_ctl_register_ioctl(snd_rawmidi_control_ioctl);
1901	snd_ctl_register_ioctl_compat(snd_rawmidi_control_ioctl);
1902#ifdef CONFIG_SND_OSSEMUL
1903	{ int i;
1904	/* check device map table */
1905	for (i = 0; i < SNDRV_CARDS; i++) {
1906		if (midi_map[i] < 0 || midi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1907			pr_err("ALSA: rawmidi: invalid midi_map[%d] = %d\n",
1908			       i, midi_map[i]);
1909			midi_map[i] = 0;
1910		}
1911		if (amidi_map[i] < 0 || amidi_map[i] >= SNDRV_RAWMIDI_DEVICES) {
1912			pr_err("ALSA: rawmidi: invalid amidi_map[%d] = %d\n",
1913			       i, amidi_map[i]);
1914			amidi_map[i] = 1;
1915		}
1916	}
1917	}
1918#endif /* CONFIG_SND_OSSEMUL */
1919	return 0;
1920}
1921
1922static void __exit alsa_rawmidi_exit(void)
1923{
1924	snd_ctl_unregister_ioctl(snd_rawmidi_control_ioctl);
1925	snd_ctl_unregister_ioctl_compat(snd_rawmidi_control_ioctl);
1926}
1927
1928module_init(alsa_rawmidi_init)
1929module_exit(alsa_rawmidi_exit)